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Home⇒ Medical Science⇒ Bochemical Engineering⇒ Fermentation kinetics
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ Stationary phase is described as no further increase in the cell population after a maximum value [other wrong options] [Discuss in forum] deceleration of growth and division rate after the growth rate reaches a maximum acceleration of growth and division rate after the growth rate reaches a maximum deceleration of growth and division rate after the growth rate reaches a minimum |
Q22 ⇒ The phenomenon in which substrates are used in a sequential manner is known as diauxie [other wrong options] [Discuss in forum] trans-substrate genesis dialism multiplicity |
Q23 ⇒ In the death phase nutrients available for the cells are depleted and begin to die [other wrong options] [Discuss in forum] the number of viable cells will increase nutrients available for cells are replenished and start to multiply none of the above |
Q24 ⇒ An open system in which the growth rate is maintained by the removal and addition of media at such a rate as to maintain a constant cell density is called a turbidostat [other wrong options] [Discuss in forum] manostat chemostat culturostat |
Q25 ⇒ When intracellular enzymes of whole cells are to be used in a bio-conversion process, it is often necessary to____________the cells. permeabilize [other wrong options] [Discuss in forum] lyophilize heat-kill denature |
Q26 ⇒ Fermentor should be filled with medium upto 75-80% [other wrong options] [Discuss in forum] 65-70% 70-75% 80-85% |
Q27 ⇒ Diauxie is the stagewise uptake of nutrients [other wrong options] [Discuss in forum] growth factors microbiological die off the simultaneous uptake of nutrients |
Q28 ⇒ A higher Ks value of Monod's equation means greater affinities to substrate [other wrong options] [Discuss in forum] lower affinities to substrate unaffected with the substrate bonding lower dissociation constant value |
Q29 ⇒ The high oxygen transfer efficiencies of airlift bioreactors is due to all of the above [other wrong options] [Discuss in forum] the large aspect ratio of the reactor, which leads to a high gas hold-up the large aspect ratio of the reactor, which leads to a high oxygen solubility at the base of the reactor the draft tube, which reduces bubble coalescence in the reactor |
Q30 ⇒ The region of an airlift bioreactor in which the liquid travels in a downward direction is called the downcomer [other wrong options] [Discuss in forum] disengagement zone air riser flotsam |
Q31 ⇒ Biomass concentrations during fermentation is all of the above [other wrong options] [Discuss in forum] diluting the samples to optical density less than 0.3 monitored by controlling the changes in biomass concentrations considering that optical density is proportional to the surface area of the biomass in the sample |
Q32 ⇒ The specific growth rate (μ) is defined as the rate of individual cells division or increase in their biomass [other wrong options] [Discuss in forum] the concentration of biomass in the reactor rate of increase of total biomass in a reactor the rate of cell death |
Q33 ⇒ In the stationary phase growth rate is equal to death rate [other wrong options] [Discuss in forum] growth is proportional to death growth rate is lesser than death rate no co-relation exist between death rate and growth rate |
Q34 ⇒ A culture in a closed vessel to which no additional medium is added and from which no waste products are removed is called a __________ culture. batch [other wrong options] [Discuss in forum] continuous fed-batch semi continuous |
Q35 ⇒ The optical density sometimes drops during the lag phase because cells tend to grow without dividing leading to a decrease in the surface area to volume ratio [other wrong options] [Discuss in forum] of fast cell growth causing them to fill up with DNA cells swell up with water cells swell up with RNA |
Q36 ⇒ Residence time distribution (RTD) of a reactor is independent of micro mixing [other wrong options] [Discuss in forum] volume of reactor height of the reactor width of the reactor |
Q37 ⇒ The specific growth rate is affected by all of these [other wrong options] [Discuss in forum] sabstrate concentration product concentration oxygen supply |
Q38 ⇒ In a batch reactor specific growth rate changes during the fermentation [other wrong options] [Discuss in forum] remains constant throughout the process increases exponentially is highest during the stationary phase |
Q39 ⇒ The advantage of airlift bioreactors over stirred tank bioreactors of a similar size is both (a) and (b) [other wrong options] [Discuss in forum] higher oxygen transfer rates more uniform shear conditions less foaming |
Q40 ⇒ The contents in stirred tank rector are mixed through a mechanical agitator [other wrong options] [Discuss in forum] compressed air external pumping any of these |
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